The seat of the archbishopric moved with him and the Archibishopric of Hamburg-Bremen was then responsible for the church's mission in the Nordic region for the next 150 years.

It is difficult to determine whether his efforts made a lasting impact on the Christianization of Denmark, given their strong and at times violent rejection by Medieval vikings.

Legend has it that in 960, a missionary nammed Poppa or Poppo converted Harald Bluetooth after holding red-hot iron without being burned.

Under the reign of Canute's brother, Eric I, Lund became the seat of a new archbishopric for the Nordic region, independent from the bishop of Hamburg-Bremen.

The 12th century saw a number of monastic orders established in Denmark, namely Benedictines, Cistercians, Premonstratensians, Augustinians, and Johannites.

[2] Beginning in 1526, Christian congregations without ties to the Catholic Church began to form in Denmark, predominantly in larger cities.

[5] The crown installed new bishops, titled as superintendents, to replace the leadership of the former catholic dioceses, but on a local level church life typically remained the same and most parish priests maintained their positions.

[6] Danish subjects were forbidden to study at Jesuit schools abroad and risked banishment if they converted to Catholicism.

However, foreign dignitaries were allowed to conduct private church services in their homes, which were in principle only to be attended by their own household.

In the 18th century, the Austrian Embassy used this rule to function as a church for a small population of local Catholics, primarily foreign soldiers, officers, and courtiers.

In 1868, Denmark was elevated to an independent apostolic prefecture and the parish priest of St. Ansgar's Cathedral, Hermann Grüder (1828–1883) was appointed as prefect by the Vatican.

During von Euch's tenure as bishop, the number of parishes increased from 8 to 28, while religious communities of Redemptorists, Montfortians, Camillians, and Jesuits, among others, were established.

Because the majority of Catholic congregations in Denmark were composed of converts, mass was at times made more accessible to those familiar with Protestant services.

Though Catholics believe that the proposed regulation is aimed primarily at Muslims, the Danish bishops have said that its passage will chill religious freedom for all, and place a burden on the church, which celebrates Mass in at least 9 languages nationwide.

Bishop Czeslaw Kozon resides in St. Ansgar's Cathedral, Copenhagen, which is dedicated to the patron saint of Denmark.